Surface Mount Reed Switches
Low Power > MDSM-DT
MDSM-DT 14.7mm Surface Mount Changeover Reed Switch
RoHS
Description
The MDSM-DT Reed Switch is a miniature, surface mounting, changeover switch
with a 14.73mm long x 2.54mm diameter (0.580” x 0.100”) glass envelope. It is
capable of switching 175Vdc at 5W. The MDSM-DT has an insulation resistance
of 10
9
ohms minimum and contact resistance less than 100 milli-ohms. This reed
switch is a surface mount version of the MDRR-DT.
Features
• Surface mount SPDT
changeover switch
• Capable of switching 175Vdc or
0.25A at up to 5W
• Available sensitivity 15-30 AT
Agency Approvals
Agency
Agency File Number
E47258
E471070
DEMKO 14 ATEX 1393U
Benefits
Ampere-Turns Range
15-30 AT
15-30 AT
• Hermetically sealed switch
contacts are not affected by and
have no effect on their external
environment
• Zero operating power required for
contact closure
• Excellent for switching
microcontroller logic level loads
Applications
2.54±0.38
(.100±.015)
• Position Sensing
Ø0.56
• Level Sensing
(.022)
N.O.
• Industrial Controls
N.C.
Ø0.56
(.022)
Dimensions
Dimensions in mm (inch)
2.54±0.38
(.100±.015)
Ø0.56
(.022)
N.O.
N.C.
Ø0.56
(.022)
10.67±0.51
(.420±.020)
CL OF OVERLAP
14.73
(.580)MAX
Ø2.54
(.100)MAX
COMMON
LEAD
14.73
•
(.580)MAX
• Office Equipments
Ø2.54
Mobile
(.100)MAX
Phones
COMMON
LEAD
Switch Type
Contact Form
10.67±0.51
(.420±.020)
CL OF OVERLAP
Ø0.51
(.020)
C (SPDT-CO)
0.025
(.001)MIN
Glass
Body:
(.113)MAX
Ni-Fe wire
2.87
Ø0.51
(.020)
Note: Land pattern is Littelfuse recommendation only. User is responsible for proper PCB design.
20.32±0.25
(.800±.010)
25.40±0.25
(1.000±.010)
RECOMMENDED LAND PATTERN
19.30
(.760)
0.025
(.001)MIN
20.32±0.25
Leads: Tin-plated
(.800±.010)
25.40±0.25
Note: SPDT-CO = Single-Pole, Double-Throw, Change-Over
(1.000±.010)
RECOMMENDED LAND PATTERN
19.30
(.760)
Materials
2.87
(.113)MAX
3.50
(.138)TYP
1.60
(.063)TYP
Electrical Ratings
Contact Rating
Voltage
Current
3
1
3.50
(.138)TYP
0.51
0.94 (.020)
(.037)
0.51
0.94 (.020)
(.037)
1.60
(.063)TYP
Switching
2
3
Breakdown
4
Switching
2
Carry
Contact, Initial Insulation
Contact
Operating
Storage
5
Resistance
Capacitance
Temperature
W/VA - max.
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Ω - max.
Ω - min.
pF - typ.
°C
°C
5
175
120
200
0.25
0.18
1.50
0.100
10
9
1.0
-40 to +125
-65 to +125
Notes:
1. Contact rating - Product of the switching voltage and current should never exceed the wattage rating. Contact Littelfuse for additional load/life information.
2. When switching inductive and/or capacitive loads, the effects of transient voltages and/or currents should be considered. Refer to Application Notes AN108A and AN107 for details.
3. Electrical Load Life Expectancy - Contact Littelfuse with voltage, current values along with type of load.
4. Breakdown Voltage - per MIL-STD-202, Method 301.
5. Storage Temperature - Long time exposure at elevated temperature may degrade solderability of the leads.
© 2015 Littelfuse
Specifications are subject to change without notice.
littelfuse.com
Surface Mount Reed Switches
Low Power > MDSM-DT
MDSM-DT 14.7mm Surface Mount Changeover Reed Switch
Product Characteristics
Operating Characteristics
Operate Time
Release Time
Shock
2
2
1
1
0.7ms - max.
1.0ms - max.
11ms 1∕2 sine wave
50-2000 Hertz
50G - max.
30G - max.
11.0kHz - typ.
Vibration
Resonant Frequency
Magnetic Characteristics
Pull-In Range
Test Coil
Notes:
1. Operate (including bounce)/Release Time - per EIA/NARM RS-421-A, diode suppressed coil (Coil II).
2. Shock and Vibration - per EIA/NARM RS-421-A and MIL-STD-202.
3. Pull-In Range - Contact Littelfuse for narrower AT ranges available. These AT values are the before modification AT of the MDRR-DT.
4. Rating Sensitivity - The value at which contact ratings and operating characteristics are determined. Derating may be required below this value.
3
4
Ampere Turns
Ampere Turns
15-30
20
L4989
Rating Sensitivity
Drop-Out vs. Pull-In Chart
25
Part Numbering System
MDSM-DTR - 15-20
Max.
20
Series
Packaging
R = Tape and Reel
B = Bulk
AT Range
15-30 AT
15-20 AT
20-25 AT
25-30 AT
Example:
15-20 AT product in Bulk
packaging is MDSM-DTB-15-20
Drop-Out (AT, L4989 Coil)
15
Min.
10
5
0
0
5
10
15
20
25
30
35
Pull-In (AT, L4989 Coil)
Note: These AT values are the before-modification values of the bare reed switch.
Additional Information
Note: Chart represents the range of Drop-Out, min to max, for a given Pull-In value of
the MDRR-DT prior to modification into the MDSM-DT.
Datasheet
Resources
Samples
Packaging
Packaging Option
Tape and Reel
Bulk
Packaging Specification
EIA-RS-481-1
N/A
Quantity
3000
200
Quantity and Packaging Code
R
B
Taping Width
32mm
N/A
© 2015 Littelfuse
Specifications are subject to change without notice.
littelfuse.com
Surface Mount Reed Switches
Low Power > MDSM-DT
MDSM-DT 14.7mm Surface Mount Changeover Reed Switch
TAPE DIMENSIONS mm (inch)
(.315)
8,00
(.079)
2,00
(.157)
4,00
+.004
-0
)
+0.10
Ø1,50
-0
(.059
(.069)
1,75
(.118)
3,00
3.0°
(.240)
6,10
(.222)
5,63
(.795)
20,20
(1.591)
40,40
(1.732)
44,00
(1.024)
26,00
(.067
-.002
)
1,70
+0,15
-0,05
+.006
(.079)
Ø2,00
(.118)
3,00
(.059
+.004
-0
)
1,50
+0,10
-0
(.138)
3,50
(.240)
6,10
3.0°
(.014)
0,36
(.106)
2,70
(.039)
1,00
(.129)
3,28
1. ALL TAPE & SPROCKET HOLE DIMENSIONS
ARE PER FIA-481 UNLESS NOTED
2. ALL POCKET DIMENSIONS ARE ±(.004") 0,10mm
3. ALL DIMENSIONS ARE TO INSIDE OF POCKET
REEL DIMENSIONS mm (inch)
(3.937±.020)
100,0±0,5
(12.992
-.030
)
330,00
+0,25
-0,76
+.010
(.075±.016)
1,9±0.4 TYP.
(1.984)
50,4 MAX.
12
0
°T
6)
.01
7± 0.4
82 1,0±
(. 2
Ø
YP
.
MEASURED AT HUB
(1.748
+.008
)
-0
(44,4
+0.2
)
-0
(.512±.008)
Ø13,0±0.2
© 2015 Littelfuse
Specifications are subject to change without notice.
littelfuse.com
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